Mocking groovy.sql.Sql.call(_,_,_) method - grails

Question

I am trying to mock the groovy.sql.Sql call(query, params[], closure) class.
Below is method, within a DatabaseService class file, that I am attempting this on.
public void getUsers(List<User> developerList, Sql sql) {
sql.call("{? = call GETUSERS()}", [Sql.resultSet(OracleTypes.CURSOR)]) { result ->
while (result.next()) {
User user = new User()
user .email = result.EMAIL
user .lastName = result.LASTNAME
}
}
}
My mock does achieve the task, however, I do not want the mocked closure to execute. I want to mock the .call(,,_) method to only skip the database logic, and return back a list to the closure in the getUsers() method. I want the closure to execute in getUsers() method, not the mocked up method.
Below is the mockup I have written in SPOCK.
void "test getUsers(list,sql) some results"() {
DataSource mockedSource = Mock(DataSource)
Sql mockedSql = Mock(Sql)
DatabaseService databaseService = new DatabaseService()
databaseService.dataSource = mockedSource
List<User> userList= new ArrayList<>();
when:
databaseService.getUsers(userList, mockedSql)
then:
1 * mockedSql.call(_, _, _) >> { return [[EMAIL: "A", LASTNAME: "B"]] }
userList.size() == 1
}
As imagined, this mockup overwrites the original method closure, and my list is never populated.. I certainly do not want to rewrite my class to use Java, nor can I change the stored procedure that is executed.

Answer 1

try :
int resultSetIdx = 0
def resutSet = Mock(ResultSet)
...
then:
1 * mockedSql.call(_, _, _) >> { args -> args[2].call(resultSet) }
2 * mockedResultset.next() >> { ++resultSetIdx > 1 ? false: true}
1 * mockedResultset.getString("EMAIL") >> "A"
In the getUsers method() change
user.lastName = result.LASTNAME
user.email = result.EMAIL
To
user.lastName = result.getString("LASTNAME")
user.email = result.getString("EMAIL")
However, you shouldn't mock Sql, but rewrite your service/dao layer to be more testable. test the dao with an inmemory db, and the service layer with a mocked dao.